A Senecio cinerascens leaf is deeply incised to form narrow, oblong lobes ascending from the midrib. Each lobe is centred by a whitish, lateral vein. A few secondary lobes grow sporadically from the bigger lobes. A narrow, rachis-like strip flanks the midrib.

The overall leaf-shape is about elliptic from lower and higher lobes being progressively smaller. Most leaves have short petioles, continuous with the midribs that are dominant in the lower leaf parts but decrease further up. Some upper stem leaves may be about stalkless. Young leaves are often erect or ascending (Le Roux, et al, 2005; Manning, 2009; Bond and Goldblatt, 1984; iNaturalist).